The powers that be here at the railroad want to recreate a street seen from an era around 1915.

This includes poles, crossarms, wires and streetlights fed from those wires. As in knob and tube, as in one wire going in one side of the Dietz converted to electricity from kerosene lamp, and the other wire going in the other side.

It's up to me to make this happen.

How can I do this, as in running splices at each lamp and individual conductors, and stay code? Especially in public spaces.

Without knowing the exact details, I suggest that you have a mock up that is dead that looks exactly right, yet is fed by a concealed method. Thus looks correct, but is safe and meets current code requirements. I know, easier said than done, but working with historical architects, we have been able to find satisfactory methods and devices so far (I am not an expert by any meaning of the word).

It is also possible to receive special permission to use any wiring method for special purposes such as exhibits, etc.. I'd make the case to the AHJ that you are following whatever code and standard of the day to reproduce a copy of the era.

I worked for a guy that actually wired a room in his house with exposed knob and tube with AHJ permission. Let's face it, you're trying to reproduce a limited version, should be really neat, please send pics when you're done!!

What the others have suggested is exactly what I have done before. We did the Indiana Jones ride at Disneyland and all the fixtures were custom made to look of that era. Wiring was to current codes and concealed. fake wiring was added in some places to look like it was being fed overhead. Special lamps with the markings on the side were used (instead of on the bottom)custom frosting and effects via dimmer control modules. It can be done but it may be expensive.